On Wed, May 14, 2008 at 10:05 AM, Jerry Van Baren gvb.uboot@gmail.com wrote:
Steven Woody wrote:
On Tue, May 13, 2008 at 2:07 PM, Wolfgang Denk wd@denx.de wrote:
Dear Steven,
in message ed4892840805121852t46d4c4d0rd52a9eb129121f7b@mail.gmail.com you wrote:
Q1:
Both 5.9.5.1 (
http://www.denx.de/wiki/view/DULG/UBootCmdGroupDownload#Section_5.9.5.1.
) and 5.9.5.6 ( http://www.denx.de/wiki/view/DULG/UBootCmdGroupDownload#Section_5.9.5.6. ) talk about booting image via network, but there are only few lines of description about these commands. I don't know which one I should use, tftpboot or bootp? And, for each one, what's the requirement on
That depends on what you want to do. Do you understand the differecne between TFTP and BOOTP (resp. DHCP) protocols?
I understand tftp and bootp as a function of current DHCP, but I don't know how tftp and bootp is related. Would you suggest me something to read? Thank you.
Bootp is a boot protocol that allows a system to query a server to figure out what IP it is assigned and what executable file to load (typically via TFTP). DHCP is the successor to bootp.
TFTP is a file transfer protocol that allows a system to load its executable (typically) file from the server.
http://www.linuxjournal.com/article/5465 (ignore RARP, it is deprecated).
HTH, gvb
Thank you Jerry, I now understand TFTP and BOOTP should on a same host, the 'filename' parameter in dhcpd.conf specified the boot image file which can be download via tftp by u-boot. And, nfs server can be on another server, the 'next-server' parameter in dhcpd.conf specified the ip address of the nfs server.
But one thing I am not clear: the u-boot's bootargs variable uses nfsroot=${serverip}:${rootpath} are the 'serverip' and 'rootpath' set by querying BOOT server in u-boot's bootp stage? if so, serverip should equals to the next-server parameter in dhcpd.conf, and rootpath should equal to root-path parameter in dhcpd.conf. You see, in u-boot, it is rootpath, but in dhcpd.conf, it is root-path, is there a typo in the u-boot manual?
And, in the u-boot manual, I see, the `filename' parameter in dhcpd.conf is something like /tftproot/uImage, but I think it should be /uImage, because the /tftproot should be the root path of tftp server, to the client, the path name should be /uImage, am I right?
Thank you very much.
$rootpath, was this variable set by querying BOOTP server?